<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>天气案例</title>
    <script type="text/javascript" src="../js/vue.js"></script>
</head>
<body>
  <div id="root">
    <h2>今天天气很{{info}}</h2>
    <button @click="changeWeather">切换天气</button>
  </div>
</body>
  <script type="text/javascript">
      Vue.config.productionTip = false;
      new Vue({
           el: '#root',
           data:{
               isHot:true
           },
           computed:{
               info(){
                   return this.isHot?'炎热':'凉爽'
               }
           },
          methods:{
               changeWeather(){
                   this.isHot = !this.isHot
               }
          }
      })
  </script>
</html>
